[Ffmpeg-devel] [PATCH] AC-3 encoder volume
Michael Niedermayer
michaelni
Sun Mar 18 23:20:51 CET 2007
Hi
On Sun, Mar 18, 2007 at 04:51:19PM -0500, Justin Ruggles wrote:
> Hi everyone,
>
> This bug has been bothering me for a while. The AC-3 encoder is
> producing output with too high volume, which even results in clipping in
> many cases.
>
> The attached patch fixes the problem and updates regressions. Here is a
> little history. Revision 5281 changed v-8 to v-9. Revision 7160
> changed v-9 to v-10. But after that change I've found the resulting
> file to be noticeably too loud when played.
>
> To avoid basing the argument on my ears, I've attached a comparison I
> did with a mono clip of a 1kHz tone at 85% of full dynamic range. The
> screen shot shows 3 different files in Audacity. The top box is the
> original file, offset by 256 samples to account for the AC-3 delay. The
> middle box is the results from encoding _without_ the patch, then
> decoding with a52dec. The bottom box is the results from encoding
> _with_ the patch, then decoding with a52dec.
patch ok, and please cite the whole commit message of the commit this
reverses (with revision number ...) in the new commit message
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
I count him braver who overcomes his desires than him who conquers his
enemies for the hardest victory is over self. -- Aristotle
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